High-precision half-life measurement of the β+ decay of 21Na
Abstract
The β+ decay of 21Na to 21Ne is one of the four cases currently being used to determine the value of Vud from nuclear mirror (T =1 /2 ) transitions. To date, published values for the half-life of 21Na have not been consistent with one another. We report here a new measurement of the half-life: 22.4615 ±0.0039(stat )±0.00150.0001(syst )s . This result increases the world average of the 21Na half-life by 0.0048 s and reduces the uncertainty by a factor of 1.5.
- Publication:
-
Physical Review C
- Pub Date:
- July 2018
- DOI:
- 10.1103/PhysRevC.98.015502
- Bibcode:
- 2018PhRvC..98a5502S